IHI 9NX - Overload Relief Valve Pressure Measuring and Adjusting Procedure

4. Over load Relief Valve Pressure Measuring and Adjusting Procedure
Conditions
Measuring
procedures
I Procedures I Note
1. Engine speed : Low idle
2. Hyd. oil Temp.
: 45 to 55°C
3. lnstall of pressure gauge : lnstall the
pressure gauge (300
kgflcm2) to the
arm dig line with hose adapter.
Since the over load relief valve has a
little of flow,
2!lmin, at the pressure
setting, no measurement can be made
with the pump flow. Measure the
pressure following procedure to relieve
over load relief valve by setting the arm
cylinder with TRAVEL.
1. Lower the bucket to the ground.
Stop the engine. Remove the fill plug
on the hydraulic tank. lnstall the
Do not remove the gauge port plug until
air pressure has been relieved
in
hydraulic tank.
1. Lower the bucket
Pressure gauge
to the ground
1
~ngine off
Relieve tank
pressure
I"UY
install the gauge
pressure gauge to the arm IN line
with hose adapter. lnstall the fill plug.
(Fig
1 & 2)
2. Measure the over load relief valve.
(For arm IN line)
(1) Start the engine, move the bucket
contact to the hard wall. (Fig. 4)
(2) Move the engine throttle lever to low
idle. Pull the travel levers fully stroke
to hold it, and measure the pressure
while travelling. (Fig. 4)
(3) For the boom over load relief valves,
replace the arm IN over load relief
valve with it to measure the
pressure.
3. Lower the bucket to the ground. Stop
the engine. Remove the fill plug on
the hydraulic tank.
4. Remove the pressure gauge and
hose adapter. lnstall the arm IN line
hose to tube. lnstall the
fill plug on
the hydraulic tank.
Gauge
Fig.
2 Hose
PT114 for gauge hose
PF
\ PF
Fig. 3 Hose adapter
114
: 0472 953 01
318
: 0472 953 02
Read the gauge
while travelling
9
Reverse travel with slowly
Fig. 4